Puzzles by Sam Loyd - http://www.thinks.com/puzzles/loyd/loyd.htm Ten puzzles from a collection that appeared in various newspapers and magazines over the previous fifty years.
Tree Riddle - http://www.thinks.com/riddles/tree.htm An old multiple riddle. Identify 65 names of trees.
Amusements in Mathematics - http://www.thinks.com/puzzles/dudeney/dudeney.htm Riddles by Henry Ernest Dudeney.
Opossum Sally's Goldenmean - http://possumsal.homestead.com/ Collections of jokes and riddles from penpals.
Jason's Puzzler Page - http://www.jasonspuzzlerpage.150m.com/ Small collection of riddles with answers.
Riddles - http://www.leisureideas.com/riddles.htm Some challenging riddles to solve. Answers below each of them.
Riddle Planet - http://www.mtgplanet.com/riddleplanet A contest with twenty-five riddles per each classified round with a money prize for the first person to solve them all.
Braingle's Riddles - http://www.braingle.com/Riddle.html Contains thousands of popular riddles, as well as user submitted and rated riddles.
HumorShack - http://humorshack.com/archive/riddles/index.shtml Archive of cartoons, riddles with answers and a free mailinglist.
Harder Riddles - http://puzzle.dse.nl/harder/index.html Some harder riddles marked with stars to identify the degree of difficulty of each riddle. Accompanied with answers.
Fleabusters' Kids Fun Page - http://www.fleabuster.com/Kids/kjokes.html Riddles with responses as well as unanswered.
RiddleAday - http://www.riddleaday.com/ Riddles, puzzles and brain teasers to challenge and entertain all ages. [E-mail lists]
Sureshot Riddles - http://www.sureshotsoftware.com/riddles/ A fun and challenging collection of logic riddles and sequences.
Stumpers - http://www.concentric.net/~Ahenson/riddles.html Math and word riddles, which were created by students in Mrs. Henson's classroom. Includes answers.
PickandSend - http://www.pickandsend.com/riddles/puzzles.htm A collection of brain teasers, riddles, and logic puzzles. Answers on highlight, sending feature.
Riddle of the Week - http://www.frontiernet.net/~carlise/riddle/index.html Just one question a week. Answer on e-mail.
Able2Know - http://www.able2know.com/aa_riddles.php A public forum for riddlers and riddle lovers in several topics.
Puzzles & Riddles - http://www.experts-exchange.com/Miscellaneous/Puzzles_Riddles/ IT experts provide answers to some of the most demanding puzzles and riddles.
DiMensIoNS - http://www.some-guy.com/riddle.html?contents Riddles abound, odd and complex riddles, brain teasers. Explained meanings and complete answers.
Tyfani's Weekly Riddle - http://www.geocities.com/horselovertw/wr/ Offers mad gab-type riddles with solutions and archives.
Scatty.com: Riddles - http://www.scatty.com/jokes/riddles/index.html Collection, sorted into lots of categories to amuse, puzzle and test.
Random Riddles - http://www.srainc.com/people/brentr/riddles2.html A collection of submitted riddles.
Spreadsheet Jokes - http://www.j-walk.com/ss/jokes/riddles.htm A bunch of riddles on spreadsheet programs.
Riddles.com - http://www.riddles.com/ Large riddle database categorized by difficulty. Includes a search feature.
BrainDen.com: Brain Teasers and Riddles - http://brainden.com/puzzles-riddles.htm Classic puzzles and riddles sorted in several sections - general logic, weighing puzzles, Einstein's riddles, number sequences, and crossing river.
A Collection of Quant Riddles - http://puzzles.nigelcoldwell.co.uk Logical and lateral type thinking riddles with some answers.
MindBreakers - http://www.mindbreakers.com/ Since 1995 free puzzles, riddles, brain teasers, quizzes, and games. Fascinating riddles and multipart puzzles.
The Riddle Contest - http://www.theriddlecontest.com/ An online contest for riddle lovers. Expect to encounter a broad array of different puzzle types as well.
Historiddle - http://historiddle.50webs.com/ Collection of free internet puzzles, riddles and brain teasers based on the history of the 20th century.
OnlyRiddles.com - http://www.onlyriddles.com/ Searchable database of riddles with answers. Accepts visitor submissions and offers an RSS feed.
The Masters of Logic - http://www.helary.de/logic/pers/aufg/index_aufg.html The difficulty of the logic puzzles increases until almost unsolvable. The list "The Masters of Logic" shows the solutions.
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